Scout is a 75 Lbs, 10-month old Shepsky (German Shep/Husky mix) - she is very strong and it was clear that the medium sized harness we'd purchased for her at 5 months was on it's last rung size-wise and it's usefulness against a dog her size was purely visual at that point. We took her into the Flagship store and the staff, as always, was wonderful. We've used the front leash clip more with this one to get her used to the overall size of this harness as well as redirecting some of that patented Shepsky energy. She comes out with us a fair bit and always needs an arsenal of treats, which she now can carry herself. This has helped tremendously in getting me back into a purse rather than a small backpack when we go out. I'm shortly going to be personalizing with her name on the side of the pockets as there is ample space and my cricut is staring me down.